As Brian says, "life prepared us for each other". It has to be fate that this couple found each other. If he was still on his original career path, if Dan and Vinny didn't tease him that he needs a Jewish girl, if Allison's mom didn't approve of Jewish boys from Long Island, if both of them weren't patient and understanding enough to meet after 7 cancelled dates, and many other small events they wouldn't have. But these events and many others did happen and they thank each of these moments for guiding them to each other.